Bently Nevada 30000-00-08-18-02 Eddy Current Proximity Probe Product Specification
30000-00-08-18-02 is a factory pre-calibrated ultra-short flush-type eddy-current proximity probe belonging to Bently Nevada 30000 series, designed and manufactured in compliance with API670 international standard for turbomachinery supervisory instrumentation and rotating machinery safety protection systems. Matched with factory-certified extension cable and compatible proximitor transducer, the probe forms a complete closed-loop non-contact displacement measurement circuit based on eddy-current induction principle. It converts real-time clearance variation between flush sensing end face and metallic rotating shaft into stable linear DC voltage output to continuously monitor radial shaft vibration, axial thrust displacement and Keyphasor rotational speed. This compact miniature sensing unit is widely applied on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers across thermal power generation, petrochemical refining and heavy metallurgy industries. Every finished probe undergoes full-loop capacitance matching test, wiring continuity inspection, alternating high-low temperature cyclic aging and connector sealing durability test before factory delivery, ensuring stable measuring precision under harsh industrial conditions with drastic temperature fluctuation, dense lubricant oil mist and complex electromagnetic interference. All analog output signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to trigger pre-alarm and emergency trip interlock, effectively avoiding severe mechanical damage caused by excessive rotor offset and over-limit vibration amplitude.
Description
Bently Nevada 30000-00-08-18-02 Eddy Current Proximity Probe Product Specification
1. Product Overview
30000-00-08-18-02 is a factory pre-calibrated ultra-short flush-type eddy-current proximity probe belonging to Bently Nevada 30000 series, designed and manufactured in compliance with API670 international standard for turbomachinery supervisory instrumentation and rotating machinery safety protection systems. Matched with factory-certified extension cable and compatible proximitor transducer, the probe forms a complete closed-loop non-contact displacement measurement circuit based on eddy-current induction principle. It converts real-time clearance variation between flush sensing end face and metallic rotating shaft into stable linear DC voltage output to continuously monitor radial shaft vibration, axial thrust displacement and Keyphasor rotational speed. This compact miniature sensing unit is widely applied on critical high-speed rotating equipment including steam turbines, centrifugal compressors, turbo-generator sets, boiler feedwater pumps and industrial blowers across thermal power generation, petrochemical refining and heavy metallurgy industries. Every finished probe undergoes full-loop capacitance matching test, wiring continuity inspection, alternating high-low temperature cyclic aging and connector sealing durability test before factory delivery, ensuring stable measuring precision under harsh industrial conditions with drastic temperature fluctuation, dense lubricant oil mist and complex electromagnetic interference. All analog output signals are transmitted to Bently 3500 monitoring rack, field DCS or PLC control system to trigger pre-alarm and emergency trip interlock, effectively avoiding severe mechanical damage caused by excessive rotor offset and over-limit vibration amplitude.
2. Part Number Coding Definition
The five-segment part number follows standardized modular coding rules of 30000 series with fixed parameter definition for each section:30000 stands for core product series specification: 11mm outer diameter probe with standard M14×2 metric mounting thread, factory fixed sensitivity of 3.94V/mm, fully electrically compatible with Bently 3300 and 3500 series proximitor modules.00 represents zero exposed unthreaded sensing tip; the probe detecting end face is completely flush with thread end surface without any protruding sensing rod, specially configured for compact closed bearing housings where tip penetration into internal lubrication cavity is prohibited.08 defines total stainless steel probe housing length of 80 millimeters, engineered for extremely confined ultra-shallow mounting holes on micro compact bearing pedestals with minimal installation space.18 specifies factory pre-molded integral built-in probe cable length of 1.8 meters; this fixed cable length is pre-calculated into full closed-loop capacitance matching together with matched extension cable and proximitor. Random field cutting or replacement with unmatched cable will break original impedance balance and result in measurement zero drift and non-linear measuring error.02 denotes standard cable and connector setup: non-armored fluoropolymer outer jacket equipped with gold-plated ClickLoc stainless steel threaded coaxial connector at cable tail end, no external metal armor or customized plug modification. All mechanical and electrical parameters are fixed after factory calibration and cannot be arbitrarily modified during on-site installation and commissioning.
3. Mechanical and Raw Material Specifications
Internal induction winding core is made of high-stability precision alloy wrapped with high-temperature resistant modified PPS insulation layer to maintain stable dielectric constant and outstanding oil-proof & anti-corrosion performance under long-term lubricant mist immersion and varying ambient temperature. Probe outer housing adopts precision CNC machined solid stainless steel with superior rust-proof, anti-impact and high-temperature steam resistant property for long-term installation adjacent to high-temperature equipment casing. Internal multi-strand oxygen-free copper conductors reduce high-frequency signal attenuation and strengthen anti-RFI interference capability during signal transmission. Intermediate fluoropolymer insulation matches dielectric characteristics required by eddy-current working principle. Outer cable sheath is wear-resistant thermoplastic elastomer resisting mechanical scratch, dust accumulation and lubricant erosion. Tail ClickLoc stainless steel connector is fitted with built-in elastic rubber sealing ring to block moisture, fine metal scraps and hydraulic oil from invading inner wiring after locking connection with matched extension cable terminal. The integrated cable keeps proper flexibility and must be arranged above specified minimum bending radius to prevent outer sheath cracking and insulation damage.
4. Electrical Performance and Environmental Working Parameters
This proximity probe must be used with designated matched proximitor powered by negative DC supply ranging from -17.5VDC to -26VDC. The complete measuring loop consisting of probe, certified extension cable and supporting proximitor remains factory pre-calibrated sensitivity of 3.94V/mm, with effective frequency response ranging from 0Hz up to 10kHz to satisfy both slow static axial thrust displacement tracking and high-frequency dynamic radial vibration sampling of high-speed rotors.Permitted continuous operating ambient temperature ranges from -40℃ to +120℃ to fit low-temperature outdoor installation and high-temperature layout near hot turbine and compressor bearing housings; dry spare storage temperature is controlled between -55℃ ~ +95℃ under non-condensing storage surroundings. Applicable working relative humidity is limited within 5%RH~95%RH with no internal condensation permitted inside probe and cable to avoid insulation degradation and inner core short-circuit fault. When installed above 1000 meters altitude, shorten regular inspection cycle appropriately to compensate heat dissipation reduction caused by thin atmospheric density. The probe can withstand conventional industrial ambient vibration of 10Hz~60Hz; long-term continuous operation in surroundings filled with strong corrosive gas and uninterrupted hot steam immersion is strictly forbidden to extend service life of all internal core components.
5. Application Scope and Routine Maintenance Guidance
30000-00-08-18-02 ultra-miniature flush-mounted proximity probes serve as core sensing components of TSI machinery protection system, widely mounted on ultra-narrow shallow compact bearing supports of large critical rotating equipment in thermal power plants, petrochemical refineries and metallurgical production bases to collect real-time shaft clearance and vibration operational data for abnormal condition pre-alarm and unit emergency shutdown interlock protection, efficiently preventing severe mechanical faults triggered by excessive rotor displacement or over-limit vibration amplitude.During periodic on-site maintenance, maintenance personnel regularly check probe housing integrity, outer cable jacket abrasion and connector locking tightness to eliminate intermittent signal loss induced by loose connection or jacket rupture and subsequent oil infiltration into internal wiring. For faulty component replacement, only spare probe with identical full complete part number specification is allowed for direct swapping; any modification of flush tip structure, housing overall dimension or built-in cable length will change total closed-loop capacitance and lead to distorted monitoring data and invalid measured values. All replacement spare probes complete full electrical parameter recalibration and alternating high-low temperature cycling aging test complying with original factory standards before delivery to guarantee full interchangeability during equipment overhaul and component replacement.
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